Campbell Scientific HFT3 REBS Soil Heat Flux Plate - Manual (Page 7)

Model HFT3 Soil Heat Flux Plate
3
Never run the sensors leads directly to the surface. Rather, bury the sensor
leads a short distance back from the hole to minimize thermal conduction on
the lead wire. Replace the excavated soil back into it original position after all
the sensors are installed.
FIGURE 2. HFT3 Plate to Datalogger Connections
TABLE 1. Datalogger Connections for a Single-Ended Measurement
Description Color CR10(X), CR510 CR23X, 21X, CR7
Signal Black Single-Ended Input Single-Ended Input
Signal Reference White AG
Shield Clear G
TABLE 2. Datalogger Connections for a Differential Measurement
Description Color CR10(X), CR510 CR23X, 21X, CR7
Signal Black Differential Input (H) Differential Input (H)
Signal Reference White Differential Input (L) Differential Input (L)
Shield Clear G
4. Wiring
Connections to Campbell Scientific dataloggers are given in Tables 1 and 2.
The output of the HFT3 can be measured using a single-ended analog
measurement (Instruction 1) or a differential analog measurement (Instruction
2).
Signal Black
Signal Reference White
Shield Clear
White Dot
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